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improve padding and error messages

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This commit is contained in:
Daan Leijen 2021-12-10 11:09:19 -08:00
parent ea75c745e1
commit 28893a6c1b
5 changed files with 162 additions and 93 deletions
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36
test/main-override-static.c
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@ -9,7 +9,9 @@
static void double_free1();
static void double_free2();
static void corrupt_free();
static void double_free3();
static void corrupt_free1();
static void corrupt_free2();
static void block_overflow1();
static void block_overflow2();
static void invalid_free();
@ -22,9 +24,11 @@ int main() {
mi_version();
mi_stats_reset();
// detect double frees and heap corruption
// double_free1();
// double_free2();
corrupt_free();
double_free1();
double_free2();
double_free3();
corrupt_free1();
// corrupt_free2();
// block_overflow1();
// block_overflow2();
// test_aslr();
@ -113,13 +117,35 @@ static void double_free2() {
fprintf(stderr, "p1: %p-%p, p2: %p-%p\n", p[4], (uint8_t*)(p[4]) + 917504, p[1], (uint8_t*)(p[1]) + 786432);
}
static void double_free3() {
void* p1 = malloc(32);
void* p2 = malloc(32);
void* p3 = malloc(32);
free(p2);
free(p1);
free(p2);
free(p3);
}
static void corrupt_free1() {
void* p1 = malloc(32);
void* p2 = malloc(32);
void* p3 = malloc(32);
free(p2);
memset(p2, 0, 8); // corrupt free list entry
mi_collect(true);
p2 = malloc(32); // should trigger corrupted free list
free(p1);
free(p2);
free(p3);
}
// Try to corrupt the heap through buffer overflow
#define N 256
#define SZ 64
#define OVF_SZ 32
static void corrupt_free() {
static void corrupt_free2() {
void* p[N];
// allocate
for (int i = 0; i < N; i++) {